Mirror of the official OpenWrt uci repository https://git.openwrt.org/project/uci
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/*
* ucimap.h - Library for the Unified Configuration Interface
* Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*/
/*
* This file contains ucimap, an API for mapping UCI to C data structures
*/
#ifndef __UCIMAP_H
#define __UCIMAP_H
#include <stdbool.h>
#include "uci.h"
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
#define BITFIELD_SIZE(_fields) (((_fields) / 8) + 1)
#define CLR_BIT(_name, _bit) do { \
_name[(_bit) / 8] &= ~(1 << ((_bit) % 8)); \
} while (0)
#define SET_BIT(_name, _bit) do { \
_name[(_bit) / 8] |= (1 << ((_bit) % 8)); \
} while (0)
#define TEST_BIT(_name, _bit) \
(_name[(_bit) / 8] & (1 << ((_bit) % 8)))
#ifndef __GNUC__
#define __optmap_gen_type(_type, _field) -1
#ifndef likely
#define likely(_expr) !!(_expr)
#endif
#ifndef unlikely
#define unlikely(_expr) !!(_expr)
#endif
#else /* __GNUC__ */
#define __compatible(_type, _field, _newtype) \
__builtin_types_compatible_p(typeof(&(((_type *)0)->_field)), _newtype *)
#define __list_compatible(_type, _field, __val, __else) \
__builtin_choose_expr(__compatible(_type, _field, struct ucimap_list *), __val, __else)
#define __int_compatible(_type, _field, __val, __else) \
__builtin_choose_expr(__compatible(_type, _field, int), __val, \
__builtin_choose_expr(__compatible(_type, _field, unsigned int), __val, \
__else))
#define __string_compatible(_type, _field, __val, __else) \
__builtin_choose_expr(__compatible(_type, _field, char *), __val, \
__builtin_choose_expr(__compatible(_type, _field, unsigned char *), __val, \
__builtin_choose_expr(__compatible(_type, _field, const char *), __val, \
__builtin_choose_expr(__compatible(_type, _field, const unsigned char *), __val, \
__else))))
#define __bool_compatible(_type, _field, __val, __else) \
__builtin_choose_expr(__compatible(_type, _field, bool), __val, __else)
#define __optmap_gen_type(_type, _field) \
__list_compatible(_type, _field, UCIMAP_LIST, \
__int_compatible(_type, _field, UCIMAP_INT, \
__string_compatible(_type, _field, UCIMAP_STRING, \
__bool_compatible(_type, _field, UCIMAP_BOOL, \
-1))))
#ifndef likely
#define likely(x) __builtin_expect(!!(x), 1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect(!!(x), 0)
#endif
#endif /* __GNUC__ */
#define UCIMAP_OPTION(_type, _field) \
.name = #_field, \
.offset = offsetof(_type, _field), \
.detected_type = __optmap_gen_type(_type, _field), \
.type_name = #_type
#define UCIMAP_SECTION(_name, _field) \
.alloc_len = sizeof(_name), \
.smap_offset = offsetof(_name, _field), \
.type_name = #_name
struct uci_sectionmap;
struct uci_optmap;
struct ucimap_list;
struct ucimap_fixup;
struct ucimap_alloc;
struct ucimap_alloc_custom;
struct ucimap_section_data;
struct uci_map {
struct uci_sectionmap **sections;
unsigned int n_sections;
bool parsed;
void *priv;
/* private */
struct ucimap_fixup *fixup;
struct ucimap_fixup **fixup_tail;
struct ucimap_section_data *sdata;
struct ucimap_section_data *pending;
struct ucimap_section_data **sdata_tail;
};
enum ucimap_type {
/* types */
UCIMAP_SIMPLE = 0x00,
UCIMAP_LIST = 0x10,
UCIMAP_TYPE = 0xf0, /* type mask */
/* subtypes */
UCIMAP_CUSTOM = 0x0,
UCIMAP_STRING = 0x1,
UCIMAP_BOOL = 0x2,
UCIMAP_INT = 0x3,
UCIMAP_SECTION = 0x4,
UCIMAP_SUBTYPE = 0xf, /* subtype mask */
/* automatically create lists from
* options with space-separated items */
UCIMAP_LIST_AUTO = 0x0100,
UCIMAP_FLAGS = 0xff00, /* flags mask */
};
union ucimap_data {
int i;
bool b;
char *s;
void *ptr;
void **data;
struct ucimap_list *list;
};
struct ucimap_section_data {
struct uci_map *map;
struct uci_sectionmap *sm;
const char *section_name;
/* map for changed fields */
unsigned char *cmap;
bool done;
/* internal */
struct ucimap_section_data *next, **ref;
struct ucimap_alloc *allocmap;
struct ucimap_alloc_custom *alloc_custom;
unsigned int allocmap_len;
unsigned int alloc_custom_len;
};
struct uci_sectionmap {
/* type string for the uci section */
const char *type;
/* length of the struct to map into, filled in by macro */
unsigned int alloc_len;
/* sectionmap offset, filled in by macro */
unsigned int smap_offset;
/* return a pointer to the section map data (allocate if necessary) */
struct ucimap_section_data *(*alloc)(struct uci_map *map,
struct uci_sectionmap *sm, struct uci_section *s);
/* give the caller time to initialize the preallocated struct */
int (*init)(struct uci_map *map, void *section, struct uci_section *s);
/* pass the fully processed struct to the callback after the section end */
int (*add)(struct uci_map *map, void *section);
/* let the callback clean up its own stuff in the section */
int (*free)(struct uci_map *map, void *section);
/* list of option mappings for this section */
struct uci_optmap *options;
unsigned int n_options;
unsigned int options_size;
/* internal */
const char *type_name;
};
struct uci_optmap {
unsigned int offset;
const char *name;
enum ucimap_type type;
int (*parse)(void *section, struct uci_optmap *om, union ucimap_data *data, const char *string);
int (*format)(void *section, struct uci_optmap *om, union ucimap_data *data, char **string);
void (*free)(void *section, struct uci_optmap *om, void *ptr);
union {
struct {
int base;
int min;
int max;
} i;
struct {
int maxlen;
} s;
struct uci_sectionmap *sm;
} data;
/* internal */
int detected_type;
const char *type_name;
};
struct ucimap_list {
int n_items;
int size;
union ucimap_data item[];
};
/**
* ucimap_init: initialize the ucimap data structure
* @map: ucimap data structure
*
* you must call this function before doing any other ucimap operation
* on the data structure
*/
extern int ucimap_init(struct uci_map *map);
/**
* ucimap_cleanup: clean up all allocated data from ucimap
* @map: ucimap data structure
*/
extern void ucimap_cleanup(struct uci_map *map);
/**
* ucimap_parse: parse all sections in an uci package using ucimap
* @map: ucimap data structure
* @pkg: uci package
*/
extern void ucimap_parse(struct uci_map *map, struct uci_package *pkg);
/**
* ucimap_set_changed: mark a field in a custom data structure as changed
* @sd: pointer to the ucimap section data
* @field: pointer to the field inside the custom data structure
*
* @sd must be set to the section data inside the data structure that contains @field
*/
extern void ucimap_set_changed(struct ucimap_section_data *sd, void *field);
/**
* ucimap_store_section: copy all changed data from the converted data structure to uci
* @map: ucimap data structure
* @p: uci package to store the changes in
* @sd: pointer to the ucimap section data
*
* changes are not saved or committed automatically
*/
extern int ucimap_store_section(struct uci_map *map, struct uci_package *p, struct ucimap_section_data *sd);
/**
* ucimap_parse_section: parse a single section
* @map: ucimap data structure
* @sm: uci section map
* @sd: pointer to the ucimap section data
* @s: pointer to the uci section
*
* this function overwrites the ucimap section data, do not use on a section
* that has been parsed already
*/
extern int ucimap_parse_section(struct uci_map *map, struct uci_sectionmap *sm, struct ucimap_section_data *sd, struct uci_section *s);
/**
* ucimap_free_section: free a data structure for a converted section
* @map: ucimap data structure
* @sd: pointer to the ucimap section data
*
* this function will clean up all data that was allocated by ucimap for this section.
* all references to the data structure become invalid
*/
extern void ucimap_free_section(struct uci_map *map, struct ucimap_section_data *sd);
/**
* ucimap_resize_list: allocate or resize a uci list
* @sd: pointer to the ucimap section data
* @list: pointer to the list field
* @items: new size
*
* @sd must point to the data structure that contains @list.
* @list must point to the field containing a pointer to the list, not the list directly
* the memory allocated for this list is tracked for the section and freed automatically
*/
extern int ucimap_resize_list(struct ucimap_section_data *sd, struct ucimap_list **list, int items);
/**
* ucimap_free_item: free the allocated memory for a data structure member
* @sd: pointer to the ucimap section data
* @item: pointer to the field inside the data structure
*
* @sd must point to the data structure that contains @item.
* @item must point to the field containing a pointer to the allocated item
*/
extern void ucimap_free_item(struct ucimap_section_data *sd, void *item);
#endif